sites = ["Baidu", "Google","Runoob","Taobao"]
for site in sites:
    if site == " Runoob1 ":
        print("菜鸟教程!")
        break
    print("循环数据 " + site)
else:
    print("没有循环数据!")
print("完成循环!")
print("=====================================================")
for i in range(5):
    print(i)
print("=====================================================")
for i in range(5, 9):
    print(i)
print("=====================================================")
for i in range(0, 10, 3) :
    print(i)
print("=====================================================")
for i in range(-10, -100, -30):
    print(i)
print("=====================================================")
a = ['Google', 'Baidu', 'Runoob', 'Taobao', 'QQ']
for i in range(len(a)):
    print(i, a[i])
print("=====================================================")
for letter in 'Runoob':     # 第一个实例
   if letter == 'b':
      break
   print ('当前字母为 :', letter)